   (-assoc-n [coll n val]))
 
 (defprotocol IDeref
-  (-deref [o]))
+ (-deref [o]))
 
 (defprotocol IDerefWithTimeout
   (-deref-with-timeout [o msec timeout-val]))

(extend-protocol IHash
  goog.global.Number (-hash [o] o))

(defn hash [o] (-hash o))

(defn- scan-array [incr k array]
  (let [len (.length array)]

(defprotocol ISet
  (-contains? [coll v])
  (-disjoin [coll v])
  #_(-get [coll v])
  )

(defprotocol IStack
  (-peek [coll])
